Hi, I have an old dual processor G5 power mac. A few years ago I tried to upgrade to OSX Leopard and after a month or so my system slowly started to go wrong, first problems with emails and safari, and then other miscellaneous issues and finally it completely crashed. I cleared the hard drive, reinstalled everything, and the same thing happened. I got a local Mac service chap out to look at it and he tried a few things that didn't work and said that there were issues of compatibility with Leopard and the the old non-intel processors and recommended reinstalling Tiger. Which I did and have stuck with it since then with no problems. But now I am starting to find that I can't buy new software for 10.4 so I was wondering if anyone knows about this compatibility issue and knows whether Mac ever eventually sorted it out with updates etc. I still have Leopard in my draw but have never dared to try to install it again. I am told that Leopard is the last operating system that i can use with the non-intel processors so aside from buying a new computer - which I can't afford - retrying Leopard is probably my only option but I don't want to risk it if there is a chance it will kill my computer again. If anyone knows anything about this I'd be really grateful.